When pressing a button on control panel, it just beeps three times, and doesn't do anything. All of the buttons do this, including timer buttons, except for "micro cook power", "broil", "crisp", "convect quick preheat" and "cancel off", which don't beep or function.. Clock time still shows on display. I tried to turn off power at the circuit breaker. This allowed me to push the "easy minute start" button a few times, which started the micro, but then it didn't work again after that.